Nematic liquid crystals and method of production

Details Nematic liquid crystals and method of production Nematic liquid crystals and method of production

1982-07-20

1985-05-28

Gron, Teddy S.

Compositions

Liquid crystal compositions

Containing nonsteryl liquid crystalline compound of...

25229964, 260463, 350350R, 560 1, 560 60, 560 61, 560 70, 560 72, 560 73, 560105, 560107, 560108, 560126, 560138, G02F 113, C09K 334, C07C231119, C07C231120

Patent

active

045199361

ABSTRACT:
The invention relates to nematic liquid crystals in electro-optical components for the modulation of light as well as for the representation of numerals, signs and images and to a method for producing the same.
It is the object of the invention to create nematic liquid crystals which are well suited for electro-optical devices, preferably for two-frequency operation.
It has been found that pure or mixed 2-n-alkyl-1, 4-bis-[4-acyloxy]-benzenes of the general formula ##STR1## wherein R.sup.3 =n-C.sub.m H.sub.2m+1, with m=3 to 14, are well suited for utilization in electro-optical components.
It was found that 2-n-alkyl-1,4-bis-[acyloxy]-benzene which is well suited for electro-optical components, and especially for two-frequency operations, can be produced by the conversion of a correspondingly substituted benzoic acid or cyclohexane carboxylic acid or a reaction-capable derivative thereof with the corresponding 2-n-alkylhydroquinone--also in the form of its phenylate--at a temperature ranging from 0.degree. C. to 250.degree. C., possibly in the presence of an inert solvent.

REFERENCES:
patent: 4099856 (1978-07-01), Weissflog et al.
patent: 4293434 (1981-10-01), Deutscher et al.
Demus, D., et al., Mol. Cryst. Liq. Cryst., vol. 63, pp. 129-144, (Jan. 1981).
Arora, S., et al., J. Org. Chem., vol. 35, No. 12, pp. 4055-4058, (1970).
Dewar, M. J. S. et al., J. Am. Chem. Soc., vol. 92, No. 6, pp. 1582-1586, (1970).
Griffin, A., Mol. Cryst. Liq. Cryst., vol. 44, pp. 267-276, (1978).

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